Tuning means for vibrator motor



Jan. 6, 1959 E. BYLUND 2,867,737

TUNING MEANS FOR vxRAfroR MOTOR Filed' July 9, 195e NVENTOR 'R'lc Y1.UND

NEYS

United tas 2,867,737 TUNING MEANS FOR VIBRATOR MOTOR Eric Bylund,Lancaster, Pa., assignor to Schick Incorporated, Lancaster, Pa., acorporation of Delaware Application July 9, 1956, Serial No. 596,691 4Claims. (Cl. S10-19) This invention relates to small magnetic vibratorsof the kind sometimes used for actuating electric Shavers.

Such motors are usually attached by hold down screws to a suitable basewhich, commonly, is one half of a plastic molded case which carries theshearing head of the shaver, the head consisting of a stationary cutterand a movable cutter which is reciprocated by the armature of thevibrator motor.

The proper tuning of such a vibrator motor for most effective operationcan be reliably accomplished only when the motor is under load, that is,coupled to and driving the inner cutter, which means that it needs to betuned after the motor unit and shaver case have been substantiallyassembled.

The present invention has for its object the provision of simple,reliable means whereby such tuning can be readily accomplished.

Generally speaking, the invention is, in a vibrator` structure of thekind including a base, a magnetic vibrator unit attached thereto andincluding an armature, a leaf spring supported at one end on the saidunit and having its other end connected with the armature andestablishing its at-rest position in relation tothe poles` of the unit,the improvement which comprises means for clamping a part of the springremote from its said other end to the base independently ot theattachment of the unit to the base and in different positions ofadjustment to vary the setting of the spring and armature in relation tothe unit.

The invention will be readily understood from the following descriptionof the accompanying drawings of which:

Fig. l is a front elevation of a vibrator unit and base incorporatingthe preferred form ot the invention;

Fig. 2 is a broken out view of a portion of Fig. l showing the parts ina different position of adjustment;

Fig. 3 is a section on the line 3 3 of Fig. l; and

Fig. 4 is a perspective view of an adjustment tool.

The vibrator unit 1 shown for purposes of illustration includes anarmature 2, poles 3, 4 (Fig. 2), coil 5 and armature spring 6. One endof the latter is connected to the armature and its other end issupported on the motor unit. In this form such support is afforded by ayieldable bracket 10 which forms an extension of a plate 11 riveted tothe eld structure. The armature has an extension 12 carrying a head 13which is engaged with the inner cutter 14 of shearing head 15. Thedetails of the latter are of no consequence so far as the presentinvention is concerned, it being understood that when the coil isenergized (either by alternating current or by direct current through asuitable make-and-break device) the armature oscillates and reciprocatesthe inner cutter through extension 12 and head 13.

In the illustrated construction the base 16 to which the vibrator unitis shown secured by hold down screws .20 is not the usual shaver casebut is a rigid cradle strucy iture which, per se, forms no part of thepresent invention.

2,867,737 Patented Jan. 6, 1959 ice As will be understood, however, theinvention is indifferent to whether the base is such a cradle or aconventional shaver case section.

According to the invention, as previously stated, means are provided forclamping a part of the armature spring, remote from the end attached tothe armature, to the base in various positions of adjustment. Such meansare arranged to ilex the bracket 10.

Specically, the bracket is provided with a laterally extending tab 21overlying a portion of the base and having a slot 22 which is located toexpose a pilot hole 23 in the base. The tab 21 is provided with a secondslot 24 adapted to pass a clamping screw 25 which, when tightened, holdsthe tab securely against movement relatively to the base.

To adjust or time the vibrator screw 25 is loosened. A suitable toolhaving an eccentric pin 27 to enter the pilot hole and a cylindricalbody 28 to it the smaller dimension of slot 22 is inserted in the slotand, of course, rotation of the body of the tool forces the tab to rightor left. When the desired setting is arrived at the screw 25 istightened and the adjusting tool removed. An extreme position of suchadjustment is shown in Fig. 2 for purposes of illustration.

The following is claimed:

l. In a vibrator structure the combination of a base, a magneticvibrator unit attached thereto and including an armature, a leaf springsupported at one end on the said unit and having its other end connectedwith the armature and establishing its at-rest position in relation tothe poles of the unit, and means for clamping a part of the springremote from its said other end to the base independently of theattachment of the unit to the base and in diierent positions ofadjustment to vary the setting of the spring and armature in relation tothe unit.

2. In a vibrator structure of the kind including a base, a magneticvibrator unit attached thereto and including an armature, a leaf springconnected at one end with the armature and at its other end mounted on ayieldable bracket secured to the unit, the improvement which comprisesmeans for ilexing said yieldable bracket to vary the setting of thespring and armature and means for locking the bracket to the baseindependently of the attachment of the unit to the base.

3. In a vibrator structure of the kind including a base, a magneticvibrator unit attached thereto and including an armature, a leaf springconnected at one end with the armature and at its other end mounted on ayieldable bracket secured to the unit, the improvement which comprises alaterally extending tab attached to said bracket and overlying a portionof the said base, means for adjusting the position of the tab and hencethe bracket and spring and means for clamping the tab to the saidportion of the base.

4. In a vibrator structure of the kind including a base, a magneticvibrator unit attached thereto and including an armature, a leaf springconnected at one end with the armature and at its other end mounted on ayieldable bracket secured to the unit, the improvement which comprises alaterally extending tab attached to said bracket and overlying a portionof the said base, said portion of the base having a pilot hole and saidtab having a slot exposing the pilot hole, said hole and slot adapted toreceive an adjustment tool for adjusting the position of the tab andhence the bracket and spring, and the tab having a second slot for thepassage of a clamping screw for locking the tab to the base in itsadjusted position.

References Cited in the le of this patent UNITED STATES PATENTS1,589,027 Wahl June 15, 1926

